As mentioned, with 4 cars I always think I just bought a battery and probably did for one car or another. Found the record and the Mustang battery's warranty ran out a year ago. After charging it two days ago it is still holding the 10.6 volts that it came up to. Checked the Amps as suggested by TKO and it showed 5.6 mA from ground cable to neg. battery terminal. So, it the draw not enough to worry about and it's just time to replace the battery?
I am still confused why it would show voltage (9.6v) from the ground cable to the neg. battery terminal. My mind tells me if nothing is turned on, the circuit should not be completing. What am I missing here?

So, it looks like I have a regular 1966,  289 in my 64 1/2.

 Looks like I should have given a bit more information so you would have more to go on and things make a bit more sense knowing a bit more of my situation. I have not put many miles on this car. I worked at the same place for 30 year which was 2 miles from my house and for the last 8 years I have been retired. I have 4 Classic/Antique cars I try to keep on the road. So, do the math and there are not a lot of miles to go around.
Anyway, my wife told me about the Mustang through a friend. It was a true ‘barn’ find. The wife got it during a divorce. Didn’t want it, wanted to piss off the husband. Parked it for 15 years until she decided it was time to let it go. Although it was hit at one time the body was clean, the other parts, not so much. Engine was supposedly rebuilt so I changed everything else, springs, shocks, lines, brake parts, trans rebuilt, flywheel, water pump, air conditioning, radiator, added power steering, new wiring, I probably touched every bolt and screw on the car by this time.
Past month new wires and plugs. Now back to the problem. When I had the trans rebuilt there was the vibration and the mechanic said a tooth was missing on the flywheel and that was the cause. He put a new one on and I didn’t notice a difference so I made him change it out for another one and again no difference. Has it gotten worse, I think it has. I would have though the harmonic balancer also but from what I could research the vibration should get worse the faster/higher the rpm and in my case the engine smooths out. I use to be able to keep my idle around 800-900 but unless the car is completely warmed up it will stall out as soon as I try to move it. If I set it a bit above that it does not and also idles smoother. Sorry for the long response, I know some of you are not retired and have better things to do although I do appreciate the help and insight given. I’ll deal with the HyPo thing later.
Thanks again,
Randy

I have two questions. First, Car is freshly tuned and really did not notice any difference. Anyway, starts up fine but vibrates a bit, just not smooth until I start to move out and pick up some rpm and then it smooths out fine. Slow down to coming to a stop such as pulling into my driveway or to a stop sign and there is a vibration that is noticeable.
Second, when I purchased my car 20 some years ago it was sold stating it had a 289 HiPo engine in it, not the original, a 68 or 69. I never went through trying to figure out if it was or not. Can that be determined with numbers off the block and if not is there an easy way to tell? I learned to drive in a 64 ½ 289 and it is definitely stronger than it was but it could be a 302 for all I know.
As always, thanks for any input and information shared.
Randy

64 1/2 Mustang Coupe, 289, Auto, Air. Working on my instrument cluster which I have several times over the years. It has always been a hassle but today more so than normal. It never fit well (tight). Some screw clips were missing and some holes never lined up. Never took the time to make it right because it was a PITA and my body is not as forgiving as it once was. Anyway, I wanted to get it right or at least better and now I’m stuck. It never just popped right out and again no exception. I replaced all the screw clips and went to put the cluster back in and did so but nothing lined up. Bottom seemed ok but the top was sticking way out. Needed to go back in about 3/4 inch. Previously I checked that the wires were placed into their two harness holders behind the clusters inside the dash and secured so only a couple of single wires  were left. I just couldn’t push it back into place. So, I thought, get it back out and see if you can figure it out. Things got complicated. I tried pulling, twisting over and over until I was worn out and gave it a rest. It seemed to be caught along the top edge. Later I used a wide spackle/putty knife and wedged it into and along the top of the cluster and worked it back and forth and finally the right side popped out about an inch and I could then work the other side out. I looked and looked and could not figure out why this thing will not slide in and line up. I see no damage or disfiguration on any of the metal on the dash area or the cluster part. I thought maybe the  screw hole tabs in the dash bend down slightly and that is catching it but that wouldn’t prevent it from going into the dash the full distance. Any thoughts will be appreciated, ‘bout now I’m considering duct tape.Thanks,Randy

Thank you TKO, BB, BobE, Ron68, swindle, & MS! Sorry it took so long to get back to you all. It got cold and my car is out side and covered. I also needed a break. I took snippets from all your answers and checked everything and I am sure I cleaned more then I needed to but no harm in that.

It was a dead wire from the switch to the solenoid. I tried to pull the wire out to try and see if I could actually see the problem but I could not, it broke underneath the dash and I did not care to make myself into a pretzel to get it out. So, car is back running with lots of clean ground connections at the solenoid and the new main ground strap plus a few other places. Thanks again!
Randy

Thank you for your input. No offense taken. I will try your suggestions tomorrow and get back.
Thanks a  bunch!
 

Thank you all for replying. I installed the AC years ago and took it to a shop to charge the system. I'm sure I have R-134 in my garage somewhere. I know nothing about AC and don't have a clue how to get the R-134 into the system. From the little I have heard over time is there is a high pressure side and that is one concern. Any, I have included pics. If someone could inform me of what I do where, I would appreciate it.
Thanks again!

64 1/2, 289, C4, Painless wiring harness (10 years old).

 I seem to be chasing my tail. Sorry for the long post but I want to give as much info. as possible. Here’s the story:1. Went to start the car, would not start, car just grunted. Tried to jump it and would not jump. Pulled the batter to buy another one. Virus thing hit and battery sat for several months.Checked batter a couple days ago that was sitting in my drive way and it tested at full charge. I was totally mystified. Put it back in the car.2. Attempted to start car and did not on the first try, When I turned the key off the car continued to turn over. I pull the key and it kept turning for around 25 seconds. Being glad it didn’t start fearing knocking out teeth on starter or flywheel.3. My best guess was solenoid. Changed that out and it was fine, for a while. Don’t know why I didn’t think to bypass the solenoid but I didn’t. Ordered a solenoid and replace it. All things seemed good.4. Radio was not working well and I changed it out. I can not remember if I ran the car at this time.5. Week later went to start the car, nothing, no click, no grunt no noise at all, no dash lights. Went to charge the batter. Have a new charger that also analyzes the battery. I could not analyze it. Took the battery out and on to Advanced Auto Parts.6. Advanced Auto could not analyze it either, bought new battery and installed. Nothing again.7. Turn key to on and shorted out the two large screws on the starter solenoid, engine started. Shut car off with the key. Started it a few more times with no problem. Started again, maybe on the 4th time, turned off and car continued to run, removed the key, ran around to the battery and as quickly as possible pulled the positive battery cable.8. When I went to put the cable back on I noticed it was hot, sparks flying. Now that was new. When I installed it, Cold, not sparks at all. 9. OK, short in the switch keeping it hot? Removed the switch unit, unplugged all the wires. Pu

64 1/2, 289 HP, Coupe, red. 

I put in power steering  a year or so back. All was OK until my turn signal cancel stopped working about a month ago. Thought I’d tackle that this weekend. Removed the steering wheel expecting to see a broken plastic part but all looked well. Searched the site and examined the gap between the wheel housing and the column. It has grown. When I finished with the power steering install I notices about a 1/8” gap and thought that was a bit large, larger than what I had. Now it was larger. I attempted to simply loosen the column and move it up towards the steering wheel, not good. Now I can drive my car through the gap. 

I did notice that when replacing the steering wheel there were bolts missing that at one time appeared to be there and that sent up a red flag but I could not find them on any parts list. They are located at  12 and 6 o’clock. It did drive and all worked well for several years. 

So, I’m assume these bolts and nuts did have a needed purpose that may have caused this crash and burn but am not sure how to fix it. I did take everything apart to see where these  bolt may have gone originally but did not see anything. So if this is the case I would appreciate size and length, position and pictures so I can get my turn signals to cancel and my horn to blow. Hopefully the pics uploaded. Thanks! Randy from Florida. I'm getting better at the new look.

Hi, I have not posted for a while and things seem to be a bit different. Not as easy as it was. I had a hard time finding just where to post and then there was having to posted 3 times before you could contact anyone and so forth as well as before you could upload pictures. Unless I am just missing a bunch of things or it's gettng cold and I just need to come into the house, take a shower and get a beer I'm at a loss. Some guidance please.
Thanks,
rap